<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            background-color: pink;
            display: inline-block;
            /* position: absolute;
      top: 50%;
      left: 50%; */
            /* margin-top: -100px;
      margin-left: -100px; */
            /* transform: translate(-50%, -50%); */
        }

        body {
            margin: 0;
            height: 100vh;
            /* display: grid;
      justify-content: center;
      align-items: center; */
            display: table-cell;
            width: 100vw;
            text-align: center;
            vertical-align: middle;
        }
    </style>
</head>

<body>
    <div class="box">
        哈哈哈哈哈哈哈哈哈
    </div>
</body>

</html>